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Polarizing layered film, polarizing plate and method for producing the same

A technology of laminating films and polarizing plates, applied in polarizing elements, nonlinear optics, optics, etc., can solve the problems of insufficient polarization performance of polarizing plates and insufficient contrast of display devices, and achieve the effect of good dyeing speed

Active Publication Date: 2012-12-19
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As a result of intensive studies, the present inventors have found that in the conventional method described above, when a general-purpose polyvinyl alcohol-based resin having a degree of saponification exceeding 99.0 mol % is used to form a resin layer, the resulting polarizing plate has The aspect of polarization performance was sometimes insufficient, and as a result, it was found that the contrast ratio of a liquid crystal display device using a polarizing plate was not necessarily sufficient, thus completing the present invention

Method used

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  • Polarizing layered film, polarizing plate and method for producing the same
  • Polarizing layered film, polarizing plate and method for producing the same
  • Polarizing layered film, polarizing plate and method for producing the same

Examples

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Effect test

Embodiment 1

[0133] according to Figure 4 The manufacturing method shown, making as figure 2 The polarizing plate shown.

[0134] (substrate film)

[0135] As the base film, an unstretched polypropylene (PP) film (melting point: 163° C.) having a thickness of 110 μm was used.

[0136] (undercoat layer formation process)

[0137] Polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average degree of polymerization 1100, degree of saponification 99.5 mol%, trade name: Z-200) was dissolved in hot water at 95°C to prepare a concentration of 3% by weight. aqueous solution. In the obtained aqueous solution, 5 parts by weight of a crosslinking agent (manufactured by Sumitomo Chemical Co., Ltd., trade name: SUMIREZ (registered trademark) RESIN 650) was mixed with respect to 6 parts by weight of polyvinyl alcohol powder.

[0138] The obtained mixed aqueous solution was coated on a corona-treated substrate film using a micro-gravure coater, and dried at 80° ...

Embodiment 2

[0156] As the polyvinyl alcohol used in the resin layer, polyvinyl alcohol powder (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., average degree of polymerization 2200, degree of saponification 97.5 to 98.5 mol%, trade name: AH-22) was used, except that , A stretched film was obtained by the same method as in Example 1. The thickness of the resin layer in the stretched film was 5.5 μm. In addition, the dyeing process, bonding process, peeling process, etc. were carried out by the same method as in Example 1, thereby obtaining the polarizing film of Example 2 formed of four layers: a protective film, an adhesive layer, a polarizer layer, and a primer layer. plate. The thickness of the polarizer layer was 5.6 μm.

Embodiment 3

[0158] As the polyvinyl alcohol used in the resin layer, use polyvinyl alcohol powder (JAPAN VAM & POVAL CO., LTD. manufacture, average polymerization degree 2600, saponification degree 95.5~97.5 mol%, trade name: JM-26), except this aspect Except for this, a stretched film was obtained by the same method as in Example 1. The thickness of the resin layer in the stretched film was 5.3 μm. Furthermore, the dyeing process, lamination process, peeling process, etc. were carried out by the same method as in Example 1, thereby obtaining the polarizing plate of Example 3 formed of four layers: a protective film, an adhesive layer, a polarizer layer, and an undercoat layer. . The thickness of the polarizer layer was 5.3 μm.

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Abstract

This invention provides a thin polarizing plate, which comprises protective films and polarizer layer arranged on one surface of the protective films. The polarizing plateeof this invention can give a good contrast in a liquid crystal display device, the thickness of the polarizer layer is less than 10 [mu] m. The polarizing plate is formed by poly vinyl alcohol resin orientally absorbed the bi-colored dyes, the monomer transmittance of luminosity factor correction (Ty) is equal or more than 40% and the polarity of luminosity factor correction (Py) is equal or more than 99.9%.

Description

technical field [0001] The present invention relates to a polarizing laminated film, a polarizing plate, and methods for producing them. Background technique [0002] A polarizing plate is widely used as a supply element of polarized light in display devices such as liquid crystal display devices, and the like. As such a polarizing plate, a polarizing plate in which a protective film made of triacetyl cellulose is adhered to a polarizing film made of a polyvinyl alcohol-based resin has conventionally been used. The development of mobile devices, etc., requires thin-walled and lightweight. [0003] As a method of manufacturing such a thin polarizing plate, the following method has been proposed: after providing a polyvinyl alcohol-based resin on the surface of the base film, stretching, and then dyeing, to obtain a polarizing laminated film having a polarizer layer, the It is directly used as a polarizing plate, or after bonding a protective film on the polarizing laminated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02F1/1335
CPCG02F2201/50G02F1/133528G02B5/3033G02F1/13363
Inventor 九内雄一朗
Owner SUMITOMO CHEM CO LTD
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